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Type: Artigo de periódico
Title: Superlight Small Bipolarons From Realistic Long-range Coulomb And Fröhlich Interactions
Author: Alexandrov A.S.
Samson J.H.
Sica G.
Abstract: We report analytical and numerical results on the two-particle states of the polaronic t-J p model derived recently with realistic Coulomb and electron-phonon (Fröhlich) interactions in doped polar insulators. Eigenstates and eigenvalues are calculated for two different geometries. Our results show that the ground state is a bipolaronic singlet, made up of two polarons. The bipolaron size increases with increasing ratio of the polaron hopping integral t to the exchange interaction J p but remains small in the whole range 0≤t/J p≤1. Furthermore, the model exhibits a phase transition to a superconducting state with a critical temperature well in excess of 100 K since the small bipolarons are perfectly mobile. In the range t/J p≤1, there are distinct charge and spin gaps opening in the density of states, specific heat, and magnetic susceptibility well above T c. © 2012 American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.85.104520
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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